Quote Originally Posted by Ode to a Grasshopper View Post
I'm inclined to agree myself, a single life for an entire species seems more than fair enough to me. Even a species-for-a-species is arguably OK, subject to a variety of other factors. Where the blowing-up-the-sun routine crosses over into not-cool IMO is that there are a lot of different life-forms on Earth, so blowing up the sun would wipe out all life on Earth and thus many species rather than just one. Likewise, there are a lot of other stars around, most if not all without life, so it's not like there weren't alternatives...which seems to be (spoiler)where the other Primes came into conflict with the Fallen.
On the face of it, I take your point. However, Megatron was clearly being deceptive as he was not being entirely open about his reasons for wanting to kill that one individual. As a consequence of killing that single individual, the entire planet would be rendered lifeless. Even though Prime did not know Megatron's full purpose, he knew that his reasons for seeking it were not noble, "You'll never stop at one".

Secondly, the circumstances that TFs find themselves in where their race is in a precarious survival situation are largely of their own making. Should they be entitled to wipe out a sentient race or enitre biosphere every time their own poor choices come back to bite them in the arse?